1. Department of Anesthesiology, University of California, San Diego, La Jolla, CA.
2. Anesthesia Pain and Palliative Medicine Service, VA San Diego Healthcare System, La Jolla, CA.
3. School of Medicine, University of San Diego, La Jolla, CA.
4. Swartz Center for Neurocomputation, University California, San Diego, La Jolla, CA.
5. Department of Radiological Sciences and Psychiatry, University of California, Irvine, Irvine, CA.